Link between Indian monsoon rainfall and physical erosion in the Himalayan system during the Holocene
Ronan Joussain
(1)
,
Zhifei Liu
(2)
,
Christophe Colin
(1)
,
Stéphanie Duchamp-Alphonse
,
Zhaojie Yu
(1)
,
Eva Moreno
(3)
,
Léa Fournier
(4)
,
Sébastien Zaragosi
(5)
,
Arnaud Dapoigny
(6)
,
Laure Meynadier
(7)
,
Franck Bassinot
(6, 8)
1
GEOPS -
Géosciences Paris Sud
2 State Key Laboratory of Marine Geology [Shanghai]
3 EMBS - Evolution et Modélisation des Bassins Sédimentaires
4 Service de Radiologie [CHU Caen]
5 EPOC - Environnements et Paléoenvironnements OCéaniques
6 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
7 IPGP - Institut de Physique du Globe de Paris
8 PALEOCEAN - Paléocéanographie
2 State Key Laboratory of Marine Geology [Shanghai]
3 EMBS - Evolution et Modélisation des Bassins Sédimentaires
4 Service de Radiologie [CHU Caen]
5 EPOC - Environnements et Paléoenvironnements OCéaniques
6 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
7 IPGP - Institut de Physique du Globe de Paris
8 PALEOCEAN - Paléocéanographie
Christophe Colin
- Fonction : Auteur
- PersonId : 1152920
- IdHAL : christophe-colin
- ORCID : 0000-0002-3934-5191
- IdRef : 110606132
Stéphanie Duchamp-Alphonse
- Fonction : Auteur
- PersonId : 1364844
- IdHAL : stephanie-duchamp-alphonse
- ORCID : 0000-0002-3996-9789
Eva Moreno
- Fonction : Auteur
- PersonId : 11861
- IdHAL : eva-moreno
- ORCID : 0000-0002-2951-5265
Sébastien Zaragosi
- Fonction : Auteur
- PersonId : 896690
- IdHAL : sebastien-zaragosi
- ORCID : 0000-0002-1456-8129
- IdRef : 189039159
Arnaud Dapoigny
- Fonction : Auteur
- PersonId : 181161
- IdHAL : arnaud-dapoigny
- ORCID : 0000-0002-4966-3345
Franck Bassinot
- Fonction : Auteur
- PersonId : 913832
- ORCID : 0000-0003-2107-743X
- IdRef : 057442843
Résumé
Mineralogical and geochemical analyses conducted on cores located on the active channel-levee system of the northern Bengal Fan are used to establish changes in the weathering pattern and the sediment transport of the Himalayan system, and evaluate the effect of Indian summer monsoon rainfall during the Holocene. Our data indicate that during the Holocene, sediments from the northern Bengal Fan originate mainly from the G-B river system without any significant changes in the relative contribution of these rivers. From 9.8 to around 6 ka, relatively low smectite/(illite1chlorite) ratios and relatively high K/Si* ratios indicate high physical denudation rates of the Himalayan highlands together with a rapid transfer of the detrital material to the Bengal Fan. The period between 9.2 and 7 ka is associated to lower values of K/ Si* and corresponds to the maximum of Indian monsoon rainfall which indicates a more important chemical weathering material that rapidly transits by the G-B river system without a long storage in the Indo-Gangetic plain. From 6.0 ka to present day, higher smectite/(illite1chlorite) ratio and lower K/Si* ratio document a gradual increase of sediments originated from the Indo-Gangetic plain, characterized by higher degree of chemical weathering. During the last 2.5 ka, the drastic increase in the smectite/(illite1chlorite) ratio could be associated to enhanced alteration of the plain soils due to anthropogenic activity. The comparison of mineralogical and geochemical data with previous reconstructions of the Indian monsoon dynamic indicates a rapid response of erosion and sediment transfer of the G-B river system to changes of monsoon rainfall intensity.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Link between Indian monsoon rainfall and physical erosion in the Himalayan system during the Holocene
|
Résumé |
en
Mineralogical and geochemical analyses conducted on cores located on the active channel-levee system of the northern Bengal Fan are used to establish changes in the weathering pattern and the sediment transport of the Himalayan system, and evaluate the effect of Indian summer monsoon rainfall during the Holocene. Our data indicate that during the Holocene, sediments from the northern Bengal Fan originate mainly from the G-B river system without any significant changes in the relative contribution of these rivers. From 9.8 to around 6 ka, relatively low smectite/(illite1chlorite) ratios and relatively high K/Si* ratios indicate high physical denudation rates of the Himalayan highlands together with a rapid transfer of the detrital material to the Bengal Fan. The period between 9.2 and 7 ka is associated to lower values of K/ Si* and corresponds to the maximum of Indian monsoon rainfall which indicates a more important chemical weathering material that rapidly transits by the G-B river system without a long storage in the Indo-Gangetic plain. From 6.0 ka to present day, higher smectite/(illite1chlorite) ratio and lower K/Si* ratio document a gradual increase of sediments originated from the Indo-Gangetic plain, characterized by higher degree of chemical weathering. During the last 2.5 ka, the drastic increase in the smectite/(illite1chlorite) ratio could be associated to enhanced alteration of the plain soils due to anthropogenic activity. The comparison of mineralogical and geochemical data with previous reconstructions of the Indian monsoon dynamic indicates a rapid response of erosion and sediment transfer of the G-B river system to changes of monsoon rainfall intensity.
|
Auteur(s) |
Ronan Joussain
1
, Zhifei Liu
2
, Christophe Colin
1
, Stéphanie Duchamp-Alphonse
, Zhaojie Yu
1
, Eva Moreno
3
, Léa Fournier
4
, Sébastien Zaragosi
5
, Arnaud Dapoigny
6
, Laure Meynadier
7
, Franck Bassinot
6, 8
1
GEOPS -
Géosciences Paris Sud
( 265597 )
- Université Paris Sud, bâts. 504 & 510, 91405 ORSAY Cedex
- France
2
State Key Laboratory of Marine Geology [Shanghai]
( 100319 )
- Chine
3
EMBS -
Evolution et Modélisation des Bassins Sédimentaires
( 476610 )
- 4, Place Jussieu 75252 PARIS Cedex 05
- France
4
Service de Radiologie [CHU Caen]
( 58755 )
- Centre Hospitalier Universitaire
Avenue de la Côte de Nacre
CS 30001
14033 CAEN cedex 9
- France
5
EPOC -
Environnements et Paléoenvironnements OCéaniques
( 778 )
- Avenue des Facultés - 33405 TALENCE CEDEX
- France
6
LSCE -
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
( 518 )
- Bât. 12,
avenue de la Terrasse,
F-91198 GIF-SUR-YVETTE CEDEX
- France
7
IPGP -
Institut de Physique du Globe de Paris
( 1852 )
- IPGP, 1 rue Jussieu, 75238 Paris cedex 05 ; Université Paris Diderot, Bât. Lamarck A case postale 7011, 75205 Paris CEDEX 13
- France
8
PALEOCEAN -
Paléocéanographie
( 1007946 )
-
LSCE. CEA Paris-Saclay. Orme des merisiers. 91190 Saint-Aubin.
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2017-09
|
Volume |
18
|
Numéro |
9
|
Page/Identifiant |
3452 - 3469
|
Projet(s) ANR |
|
Domaine(s) |
|
Mots-clés |
fr
PANOPLY
|
DOI | 10.1002/2016GC006762 |
Origine :
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